Tennis swing training device



FIG. 1 is a perspective view of tennis swing training device embodying the design;

FIG. 2 is a front elevational view of the design;

FIG. 3 is rear elevational view;

FIG. 4 is a left-side elevational view;

FIG. 5 is a right-side elevational view;

FIG. 6 is a top plan view; and,

FIG. 7 is a bottom plan view.

The broken lines shown on the drawings form no part of the claimed design. 

CLAIM The ornamental design for a tennis swing training device, as shown and described. 